I think you are mistaking 'happiness' with 'employment' here. The leather worker may adapt to the new environment to become a factory site manager. But there's no guarantee that this leads to happiness.
Also you should bear in mind, adaptation is a young man's game. Retraining is possible, but companies typically don't hire trainees in their 40s/50s, so your willingness may not be the deciding factor. My dad ended up as a postal worker when he left his career as a humanities academic at 55, no highly skilled jobs would take him (he did prefer it though haha).
Also you should bear in mind, adaptation is a young man's game. Retraining is possible, but companies typically don't hire trainees in their 40s/50s, so your willingness may not be the deciding factor. My dad ended up as a postal worker when he left his career as a humanities academic at 55, no highly skilled jobs would take him (he did prefer it though haha).